Dynamo Tracker Get Table Failure

[rgstephens]

Rasa version: 1.10.8

Issue:
The DynamoTrackerStore calls list_tables()["TableNames"] here to determine of the tracker store exists. By default, this method returns only the first 100 tables so the call can fail to find the tracker store table and then it will try and create a table that already exists.

Solution:
Use the call client.describe_table(TableName=table_name) instead of list_tables to determine if the tracker store already exists.